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# (C) British Crown Copyright 2016 - 2018, Met Office
#
# This file is part of cartopy.
#
# cartopy is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cartopy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with cartopy. If not, see <https://www.gnu.org/licenses/>.
"""
Tests for the NearsidePerspective projection.
"""
from __future__ import (absolute_import, division, print_function)
from numpy.testing import assert_almost_equal
import cartopy.crs as ccrs
from .helpers import check_proj_params
def test_default():
geos = ccrs.NearsidePerspective()
other_args = {'a=6378137.0', 'h=35785831', 'lat_0=0.0', 'lon_0=0.0',
'units=m', 'x_0=0', 'y_0=0'}
check_proj_params('nsper', geos, other_args)
assert_almost_equal(geos.boundary.bounds,
(-5476336.098, -5476336.098,
5476336.098, 5476336.098),
decimal=3)
def test_offset():
geos = ccrs.NearsidePerspective(false_easting=5000000,
false_northing=-123000,)
other_args = {'a=6378137.0', 'h=35785831', 'lat_0=0.0', 'lon_0=0.0',
'units=m', 'x_0=5000000', 'y_0=-123000'}
check_proj_params('nsper', geos, other_args)
assert_almost_equal(geos.boundary.bounds,
(-476336.098, -5599336.098,
10476336.098, 5353336.098),
decimal=4)
def test_central_latitude():
# Check the effect of the added 'central_latitude' key.
geos = ccrs.NearsidePerspective(central_latitude=53.7)
other_args = {'a=6378137.0', 'h=35785831', 'lat_0=53.7', 'lon_0=0.0',
'units=m', 'x_0=0', 'y_0=0'}
check_proj_params('nsper', geos, other_args)
assert_almost_equal(geos.boundary.bounds,
(-5476336.098, -5476336.098,
5476336.098, 5476336.098),
decimal=3)
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